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Equity and Other Comprehensive Income (Loss) - Summary of Capital Stock (Detail) - SEK (kr) kr in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Disclosure of classes of share capital [line items] |  |  |  |
Capital stock | kr 92,983 | kr 97,408 | kr 133,304 | kr 107,099
Capital stock [member] |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Capital stock | 16,743 | 16,722 | kr 16,672 | kr 16,672
Capital stock [member] | Class A shares [member] |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Capital stock | 1,309 | 1,309 |  |
Capital stock [member] | Class B shares [member] |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Capital stock | kr 15,434 | kr 15,413 |  |

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